342 ELEMENTARY ENTOMOLOGY 



twilight with a mixture of sugar and rum, sugar and vinegar, or 

 some such substance, which is painted on the trunks of trees. After 

 an hour or so the trees are visited by the entomologist, who is armed 

 with a dark lantern or a bicycle lantern. The moths are caught 

 either by means of a net or by carefully approaching the tree and 

 placing a large-mouthed cyanide bottle over the insects as they feed. 

 Warm, cloudy nights are best for this work, although one is not 

 always assured of success. 



If pieces of decaying fish, meat, or other animal matter are 

 placed in a convenient locality and examined from time to time, 

 large numbers of beetles may be collected. 



